The mode «i» (3:2i/2:3i) composes a stream by fields «duplication». It is designed for conversion of 23,976 into 29,97 fps and 24 into 30 fps.
The mode «p» (3:2p/2:3p) composes a stream by frames «duplication». It is designed for conversion of 23,976 into 59,97 fps and 24 into 60 fps.
In the given version it is not possible to set up the ECS pulldown option properly via application’s GUI (it is related to AVC encoder only). In the next product versions this option will work for AVC encoder as well.
I would suggest you use the preset profiles for encoding film source from 23,976fps into 29,97fps and 24fps into 30fps using the pulldown option. Pulldown profiles